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Variable curvature tempered glass is widely used in display cabinets for refrigerated food, side windows of buses and furniture. However, due to the fact that the glass curvature of this shape changes along the arc, it is extremely difficult to bend and temper the glass. Existing tempering furnace can hardly produce curved glass with gradient of curvature changing uniformly and smoothly, and it is even harder to process variable curvature tempered glass of various shapes with one tempering furnace. Therefore, enterprises of the industry can only produce glass of this shape by adopting thermal bending technology and using molds. The wide-ranging emergence of such a large number of hot-bending glasses in food sales areas in supermarkets and the wide use of such glass in a variety of furniture around us cause potential risks in our life. 

The LandGlasss history of research in tempering furnaces for variable curvature tempered glass dates back to ***3 when straightness of glass productsstraight edge was not yet satisfactory because of limitations of the process. Meanwhile, accuracy of curvature arc edge and uniformity of various glass curvatures could hardly be completely consistent with designed curve, so LandGlasss equipments of the first-generation of this shape were used by only a few manufacturers.  

Since the year ***1, LandGlass has made great achievements and breakthroughs in the research on tempering furnaces for variable curvature tempered glass: Firstly, LandGlass adopted new shaping methods and completely removed the flaw of first-generation equipment which produced a low accuracy of straightness. In the meantime, LandGlass used new bending technologies and has successfully produced tempered glass with curve highly consistent with the designed curve, whats more, arc repeatability of tempered glass products from different batches has reached a high level. Judging from the operation of prototype machine, new shaping methods and technologies also extended equipment maintenance period and improved the reliability of the equipment. 

With regard to the tempering demand for different curvatures, technicians of LandGlass arranged combinations of shape modules and provided various operation options to enable multipurpose operation of one machine that is capable of producing variable curvature tempered glass of various shapes. At present, the new tempering furnace of LandGlass is capable of bending and tempering variable curvature tempered glass of J-shape, S-shape and U-shape and processing tempered glass with maximum size of ***0×ARC***0, minimum size of **0×ARC**0 and minimum radius of **0mm.

The J-shape variable curvature tempered glass products were displayed at the China International Glass Industrial Technical Exhibition held in April ***2. The smooth arc and the spotless surface attracted lots of professionals. With the promotion of LandGlass variable curvature glass tempering furnace, we believe that, in the near future, the variable curvature glass with high safety and excellent quality shall replace the hot-bending glass in more fields, bring customers with more security, and make our life safer and better.